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CREATE KEYSPACE machine_tools WITH REPLICATION = {
'class': 'NetworkTopologyStrategy',
'dc-1': 1,
'dc-2': 3,
'dc-3': 3
};
Let us suppose if dc-1, dc-2 and dc-3 have 5 nodes each. During write operation one node is down in each datacenter. As per the replication factor in each datacenter, is it safe to say that I will have 6 copies of a row across three datacenters.
Your question doesn't make sense to me. There are 7 replicas in total based on the keyspace definition you provided.
If one node is down in each DC:
During write operation one node is down in each datacenter.
then with 3 DCs you have 3 nodes down meaning that you are left with 4 live replicas. I'm not sure where you got 6 from. Cheers!
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